<div class="parent">
  <div class="box01">箱</div>
  <div class="box02">箱</div>
</div>
.parent{
  display: flex;
  text-align: center;
}
.box01,.box02{
  width: 100px;
}
.box01{
  margin-right: 50px;
  background-color: pink;
}
.box02{
  margin-left: 10px;
  background-color: lightblue;
}
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